This function adds to the existing call callback, rather than replace it, by putting a callback in front of it to be tested first. The callback will be invoked when the traversal sees a call to a specific function.
add_call_callback(callbacks, fn, cb)
| callbacks | The existing callbacks. |
|---|---|
| fn | The function to which calls should be modified. |
| cb | The callback function to invoke. |
The updated callbacks.
The callback that is installed will be called with the usual callback
arguments (which depend on context and user-provided information to
..., see rewrite_callbacks() and analysis_callbacks()), and additionally
the next callback in line, through the parameter next_cb. This can be
used to propagate information through several callbacks in a pipe-like
fashion.